Installation for the production of horizontally divided flaskless sand block molds

Abstract

For the production of horizontally divided flaskless foundry molds a mold making plant is employed consisting of a vacuum mold blowing machine, joined with a casting and cooling line and a shake out station. The vacuum mold blowing machine is provide with a pattern plate swapping device and designed in the form of a single station mold making maching, in which drags and copes of a mold are produced alternately. The single mold flask is part of the mold making machine and has means for stripping it from a drag or cope before removal of the same from the machine. This makes it possible to have one core insertion station with space for a plurality of drag without having more than one machine flask.

I claim: 
     
       1. A mold making plant for producing horizontally divided, flaskless drag and cope parts of casting molds for reception on mold receiving pallets, comprising: a vacuum molding machine;   a core insertion station connected to the vacuum molding machine;   means defining a casting and cooling path; and   further means defining a plate return path, said means defining a casting and cooling path and said further means defining a plate return path being operatively associated with each other and with the vacuum molding machine;   said vacuum molding machine comprising:   a stationary mold table provided with transporting means and centering means; a foundry sand bin; means connected to the foundry sand bin for raising and lowering said foundry sand bin relative to said table; at least one pattern plate carrier positionable on the mold table alternatively with mold receiving pallets; a mold flask; an inverter connected to the mold flask for inverting the mold flask about a horizontal axis; and means for raising and lowering the mold flask and inverter relative to the mold table, wherein:   the transporting means serves to insert and remove the pattern plate carrier and pallets with respect to the mold table;   the centering means serves to position the pattern carrier and pallets with respect to the mold table;   the mold flask is adapted to engage the pattern plate carrier in order to form a mold cavity when the pattern plate carrier is positioned on the mold table, and to be stripped when a pallet is positioned on the mold table, releasing whichever mold part is involved.   
     
     
       2. The mold making plant as claimed in claim 1, wherein said vacuum molding machine comprises two pattern plate carriers, each adapted to be fitted with a respective pattern plate on one side thereof and to be shifted between a position in said vacuum molding machine and a position outside said vacuum molding machine. 
     
     
       3. The mold making plant as claimed in claim 2, further comprising means for connecting a lower side of said pattern plate carrier sealingly with means, located in said mold table for imparting pressure thereto. 
     
     
       4. The mold making plant as claimed in claim 1, wherein said transporting means comprises two vertically shiftable conveyor roller sets placed around said mold table. 
     
     
       5. The mold making plant as claimed in claim 1, wherein said foundry sand bin includes a blowing and pressing grid at a lower end thereof and means for freely selecting the height of the grid in a blowing position thereof over the mold table. 
     
     
       6. The mold making plant as claimed in claim 5, wherein the height of the blowing and pressing grid in a blowing position thereof may be freely selected independently for drags and copes. 
     
     
       7. The mold making plant as claimed in claim 6, wherein said core insertion station comprises a plurality of rests for simultaneously holding a plurality of drags. 
     
     
       8. The mold making plant as claimed in claim 7, wherein said core insertion station comprises a turntable. 
     
     
       9. The mold making plant as claimed in claim 7, wherein the core insertion station comprises a conveyor adapted to convey mold parts along the four sides of a rectangle. 
     
     
       10. The mold making plant as claimed in claim 7, further comprising a stroke sequence controller as part of said mold making machine, said controller having a shunt circuit for overriding it and producing exclusively drags or copes.